PRESIDENTIAL ADDRESS. 13 
Other noted workers, while admitting the general idea 
of coral growths upon areas undergoing submergence, have 
differed in certain particulars from the conclusions of tbe 
four illustrious authors mentioned above. 
Thus Vaughan, by long and patient but brilliant experi- 
Ments and observation, has collected a veritable array of 
facts of the utmost importance in connection with the 
growth of coral reefs on platforms of erosion. His article, 
quoted in a previous paragraph, is invaluable to all modern 
workers interested in coral reefs. 
Daly’s contribution to the problem is also memorable, 
and no explanation of coral reef origins could be considered. 
complete, which should neglect the fact repeated by him, 
namely, that both the Pieistocene coral reefs and the 
recent glacial period were controlled in a great measure 
by the opposed phases of one common agency, or which 
should neglect the fact that the sea level rose with each 
interglacial period and fell with each advance of the ice 
sheets. 
Hedley and Taylor, Wood-Jones, Mayor, and Vaughan, 
have worked in other ways again. 
Hedley and Taylor* have shown that coral reefs grow 
in crescentic curves with their convexities directed against 
the general motion of the prevailing wind. 
Mayor,” Vaughan,’ and Wood-Jones,* have demonstrated: 
conclusively, the marvellously rapid growth of coral, by 
patient and skilled experiments conducted within modern 
coral reefs. 


* Coral Reefs of the Great Barrier, Queensland, by C, Hedley and T. 
Griffith Taylor, Aus. Assoc. Ad. Sc ., Vol. x1, 397 (1907). 
* A.G. Mayor, Ecology of the Murray Island Coral Reef. Carnegie: 
Institute, Wash. D.C., 1918. * Vaughan, Ibid. * F. Wood-Jones, Coral 
Reefs and Atolls, Lowell, Reeve and Co., London, 1912. 
